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Sequestered cells in polar trophoblast region

TEM of the polar trophoblast region of a stage 3 embryo in vitro, 145-170 hours post-insemination (original magnification x12,000). Extensive cytoplasmic processes of polar trophoblast cells extend toward the zona pellucida between the sequestered cells.

CP = cytoplasmic processes of polar trophoblastic cells
SC = sequestered cells
ZP = zona pellucida

From: Lopata et al., 1982. Reproduced with permission of the publisher, John Wiley & Sons.

Keywords: cytoplasmic processes of polar trophoblastic cells, sequestered cell(s), zona pellucida

Source: The Virtual Human Embryo.